Azo dyestuffs containing a heavy metal in a complex form



. Patented May 14, 1940 UNITED STATES;

AZO DYES'I'UFFS CONTAINING A HEAVY METAL IN A COMPLEX FORM Ernst Fellmer, Leverkusen-I. G.'Werk, Germany, assignor to General Aniline & Film Corporation, a corporation of Delaware No Drawing. Application March 4, 1938, Serial v No. 193,854. InGermany November 25, 1933 V 3 Claims.

The present invention relates to new azo dyestufis containing a heavy metal in a complex form, more particularly it relates to azo dyestuiis which may be represented by the following gen- 5 eral formula:

F1? N=N Li? Y i.

wherein X stands for the hydroxy or carboxylic acid group, Y stands for the hydroxy, the amino or a substituted amino group and Z means the same as Y, wherein R, means a radical ofthe benzene or naphthalene series, R1 and R2 stand for radicals of diazotization components suitable for producing azo dyestuffs, n standsfor one of the numbers 1 and 0, R3 stands for hydrogen, hydroxyl, alkyl, halogen, COOH or SOs I-I and Me means a metal of the atomic number 24-28 inclusive.

My new dyestufis are obtainable by starting with a mono-azo dysestuff of the general formula:

wherein X stands for hydroxyl, alkoxy or the carboxylic acid group, Y, Z, R. and R3 mean the same as stated above, coupling the same with a diazo compound suitable for preparing azo dyestufis, if desired, coupling with a further diaz'o compound suitable for preparing azo dyestufis and transforming the dyestuffs into metal complex compounds of the corresponding o-hydroxy or o-carboxy azo dyestuffs. This transformation into the metal complex compounds may be performed according to known methods either in the final dyestufis or in an intermediate stage of the dyestuff-preparation, either in an acid, neutral or an alkaline medium, and, if necessary, under pressure. It is selfunderstood that in case there are used as starting compounds such azo dyestufis of the above identified second formula, in which X stands for alkoxy the conditions of working must be chosen in such a manner that the alkoxy group is split up in the manufacture of the heavy metal complex compounds. Besides in the manufacture of the new dyestuifs may be carried out in a different order as for instance by coupling the diazo component bearing the lakeforming group only in the second place with the azo component. Occasionallyby such variations difiering shades may be obtained.

The new metal containing dyestuffs are in form of their alkali metal salts generally dark, Watersoluble powders, dyeing leather generally even. shades of excellent fastness to light. The dyestuffs are in general suitable for dyeing the difierent kinds of leather such as chromium and vegetable tanned leather and also glac'leather.

Further my new heavy metalcompounds can be suitable for dyeing animal and vegetable fibers.- The present invention'is a continuation in part of my copending application Ser. No. 753,785, filed November 19, 1934, now :Patent No.1'2,111,559,' issued March 22, 1938. The invention is illustrated by thegfollowing examples without being restricted thereto, the parts being'by weight: I 3

Ezrample '1 The diazo compound prepared from 15.4 parts of 4-nitro-2-amino 1-hydroxybenzene is coupled 20 in an alkaline medium with 11 parts of 1.3-1 dihydroxybenzene. After the coupling is complete the monoazo dyestuifis isolated, again stirred ,into water andcoupled with'the diazo compound prepared from 20.1 parts of 4-amino- 25 l.3dimethylbenzene-6sulfonic acid in an alkaline medium. 'The dyestufiis isolated in the usual way. I In order to convert it into the chro-; mium complex compoundv it is boiled for several hours with an aqueous chromium sulfate solu- 30 tion acid to litmus corresponding tolOBparts of CrzO3,. made alkaline and t clarified and:- finally isolated in the usual manner. The dyestufi corresponds in the free state, i. e. in the form of the free acid, to the following formula: 5 35 No; N=N CHa OH OH x and dyes leather dark brown shades.-

Example 2- v 45 The diazo compound prepared from 23.4 parts of 4-nitro-2-amino-1-hydroxybenzene-6sulfonic acid is combined with a soda alkaline solution prepared from 10.8 parts of 1*.3-diaminobenzene. After the coupling is'complete the mono azo dyestuff is coupled with the diazo compound prepared from 21.8 parts of l-amino-Z-nitrObenzenel: sulfonic acid in a soda-alkalinemediums The disazodyestuffis isolated lay-acidifying the solu- 5 tion and adding salt. In order to convert it into the chromium complex compound it is boiled for several hours with aqueous chromium sulfate solution acid to litmus corresponding to 14 parts of CrzOs, made alkaline and clarified and finally separated in the usual manner. The chromium containing dyestuff thus obtained, which corresponds in the free state, i. e. in the form of the free acid, to the following formula:

dyes leather dark brown shades.

Example 3 i dyes leather grey to greyish-black shades.

Example'll The monoazo dyestufi obtained by coupling in an acid medium the diazo compound prepared from 13.? parts of anthranilic acid with,10.9 parts of m-amin'ophenol, is heated for 1% hours at C. in an autoclave with'a chromium formate solution corresponding to 8 parts of CrzOs. The

dyestufi is isolated from the-acidified reaction mixture and coupled in an alkaline solution with the diazo compound prepared from 21.8 parts of p-nitraniline 3-sulfonic acid. The dyestuif having in its free state, i. e. in the form of the free acid, the following formula:

dyes leather yellowish-red light to middle brown shades.

Example 5 The monoazo dyestuif obtained by coupling the diazo compound prepared from 18.9 parts of Z-amino-l-hydroxybenzenel-sulfonic' acid with 10.8 parts of 1.3-diaminobenzene, is stirred into water and coupled in a soda-alkaline medium with the diazo compound prepared from 22.3 parts of 1-aminonaphthalene-4-sulfonic acid and, when this coupling is complete, with the diazo compound prepared from 13.8 parts of I-amino-4-nitrobenzene. By boiling the dyestufi for several hours with an aqueous solution containing 25 parts of cobaltous sulfate at neutral or weakly acid reaction the cobalt complex compound of the trisazo dyestuff is obtained, which is worked up and separated in the usual mannor. The cobalt containing dyestuff which corre sponds in its free state, i. e. in the form of the free acid, to the following formula: 1

dyes leather black-brown shades.

' Example 6 The sodium hydroxide alkaline solution prepared ,from 11 parts of 1.3-dihydroxybenzene is coupled with the diazo compound prepared from 28.4 parts of 6-nitro l-amino-Z-hydroxy-riaphthalenel-sulfonic acid. The monoazo dyestuff salted out and isolated is then coupled in sodium hydroxide alkaline, concentrate solution with the diazo compound prepared from 14.3 parts of 4-chloro-2-amino-1-hydroxybenzene and, when the coupling is complete, salted out and separated. In order to, transform the dyestuff into the double metal complex compound it is boiled for several hours with an aqueous chromium sulfate solution acid to litmus corresponding to 18.7 parts of Cl'zOs, made alkaline and clarified and finally isolated in the usual manner. The dyestuff which corresponds in its free state, i. e. in the form of the free acid, to the following formula:

dyes leather grey to black shades.

' Example 7 10.8 parts of LS-diaminobenZene are coupled in weakly soda-alkaline solution with the diazo compound prepared from 23.4 parts of 6-nitro- 2-amino-1-hydroxybenzene-4-sulfonic acid. The separated monazo dyestufi which is again stirred into water is then coupled in a soda-alkaline medium with the diazo compound prepared from 22.3 parts of, 2-aminonaphthalene-6-sulfonic acidpthe .diazo dyestuff. thus obtained is then transformed into its chromium complex compound by refluxing for several ,hours with a weakly acid chromium formate or chromium sulfate solution corresponding to 10.3 parts of CrzOs, made alkaline, and clarified and finally worked up in the usual manner. The chromium complex compound of thedyestuff thus obtained corresponds in its free state, i. e. in the form of th free acid, to. the following formula:

SOaH N=N,

r N=NONH2 -S 0311 I -Cr No, on NB? J and dyes leather deep dark-brown shades.

Example 8 The diazo compound, prepared from 19.9 parts of 4.6-dinitro-2-amino-l-hydroxybenzene is coupled in an alkaline medium with 11 parts of 1.3- dihydroxybenzene. I The isolated dyestufi is combined inthe presence of caustic soda lye with the diazo compound prepared from 23.4 parts of 4- nitro-Z-amino-1-hydroxybenzene-6-sulfonic acid. When the coupling is complete, the dyestuff is isolated in the usual way and, in order to convert it into the double iron complex compound, boiled for several hours with a neutral or weakly acid solution containing 29.2 parts of ferric chloride. The dyestuff solution is made alkaline and clarified, and isolated in the usual manner; it corresponds in its free state, i. e. in the form of the free acid, to the following formula:

and dyes leather slight olive-dark-brown (niggerbrown) shades.

Q a N=NOOH HO SOaH I I OH on Emample 9 The diazo compound prepared from 46.8 parts of 4-nitro-2-aminophenol-6-sulfonic acid is couof CrzOs.

ner. in the form of the mula:

pled with 10.8 parts of 1.3-diaminobenzene, the coupling mixture being rendered alkaline in order to complete the coupling. The diazo dyestuff is isolated from the'acidified solution and transformed into the double chromium complex compound by suspending' in water and refluxing for several hours with an aqueous chromium sulfate solution in a quantity corresponding to 16 parts The chromium complex compound is freed from the excess chromium sulfate solution or chromium oxide hydrate respectively, and the reaction mixture is worked up in the usual man- The dyestuff having in the .free state, i. e.

free acid, the following for- HOzS dyes leather, and especially glac leather, deep blackish-brown shades.

Further examples illustrating the invention are stated in the following table:

Diazo component bearing 21;?) lake-forming group Azo component Flrst dlazagmponeut 333 2 2 3 5 Metal ggi g I 2-amnophenol-4-sulfonic m-Phenylene-diamine. p-Chloroaniline.. Chromium Dark brown.

aci 1.2-aminonaphthol-4-sulm-Aminophenol 2-toluidine-5-sulfonic Greenish-grey.

ionic acid. acid. Z-aminophenol Resorcmol 2-naphthylamme-d8- Reddish-brown.

. d1sulfonicacid. I 4-nitro-2-aminophenol.--. .d0 Dehydrothiotqluidme Middle brown.

disulfomc acid.

6-nitro-2-amiiiophenol-4- sulfonic acid. 4-nitro-2-ammophenol.

6- nitro-2-aminophenol-4- sulfonic acid. Picramic acid ionic acid.

Do Do 6 nitro -1.2 aminonaphthol-4-sulfonic acid. Picramic acid 4-nitro-2-aminophenol-6- sulfonic acid. Anthranilic acid 6-chloro-2-aminophenol-4- sulfonic acid.

5-nitro-2-aminophenol.

Do Do Anthranilic acid 6- chloro-2-aminophenol- 4-sulfonic acid. 4-nitr0-2-amii1ophenol Pici'amic acid 4-nitro-2-aminophenol..

m-Phenylene-diamina m-Aminophenol 'R'esorcinol. do

m-Phenylenediamine.

2 naphthylamine 6 sulionic acid.

4 chloroaniline 2 -sulionic acid.

2-naphthylamine 6 sulfonic acid.

Naphthionic acid.

Aminoazobenzene-di- .sulfonic acid.

4-amino-3 2 -dimethyl- 1 .1 -azobenzene- 4-sulfonic acid.

[a naphthylamine aniline-2.5-disulfonic acid].

Naphthionic acid- 2-niti-aniline-4-sulfonic acid.

4 nitro 2 amino-phenol-fi sulfonic acid. Picrgmic acid o 4-chloro -2-aiI|ino phenol 4-amino-3.2-di.methyl- 1.1 azobenzene -4 sulfonic acid.

o-Nitraniline 1-naphthylamine-3. 6-

disulfoiiic acid.

Sulianilic acid Naphthionic acid.

1 naphthyl sulionic acid. p-Sulfanilic acid Dehydrothiotoluidinesulfonic acid.

2 naphthylamine 6 sulionic acid.

3-amino-5-sulio-2 hydroxybenzoic acid.

2-naphthylamine-6.8-

disulfonic acid.

4-nitroz-aminophenol-fi-sulionic acid.

o-Nitraniline-sulfonic acid. p-Nitranilina.

. 1 naphthylamine 5 suliionic acid. o

p-niti'aniline 4 aminoazobenzenesulfonic acid.

o-Nitraniline sulfonic acid.

4-amino-3.2-dimethyl- 1.1-azobenzene-4'- sulfonic acid.

Naphthionic acid.

Chromium Iron Manganese.. Chromium Chromium Iron...

Iron (twice) Chromium (twice) M a n g a n e s e (twice Chromium (twice) Nickel Chromium Iron do twice Chromium (twice) Brown.

I Do.

Red-brown.

Brown. Red-brown.

Deep darkbrown.

Slightly olivishbrown.

Olivish darkbrown., Middle brown.

Brown.

Grey to black. Dark-grey.

Greenish-grey.

Red-brown.

Brown.

Reddish lightbrown.

Yellowish brown.

Black-brown.

Dark brown. Brown.

Diazo component bearing First diazo component Second diazo com- Shades on 2%?)18k8-f01'1111ng group Azo component (R!) ponent (R1) Metal atlier 6-nitro-2-amiu0phenol-4- m-Pheny1cnediamine.. [l-amino-S-hydroxyp-Nitranilinc Chromium Dark brown.

sulionic acid. naphthalene-3.6-disulioulo acid pnitranilme]. Do 2.4-d1amino-1-methyl- 2-nitro-4-ammod1- do Do.

benzene. phcnylamino-4-sulionic acid. Do ..do 4-nitro-2-aminophenol. Iron (twice) Brown. 4-nitro-2-aminophenol..... 3.5-diaminobenzcne-1- 'i-nittaniline-2'sulfonic Iron Do.

carboxylic acid. ac' Do .4 do Suliam'lic acid. Chromium Olive-brown. Picramic acid 1.3-diaminobenzenc-4- Dehydrothiotoluldlne "do Brown.

sulfonic acid. sulfonic acid. 4-nitro-2-am1nophcnol-6- Resorcinol 4-nitro-2-am1nophenol- Cobalt (twice) Red-brown.

sulionic acid. fi-sulfonic acid.

Do do do 4-amino-3.2-d1methyl- Ohromlum (twice) Do.

1.1'-azobenzeno-4- sulfouic acid. fi-nitro-Z-aminophenol-- do Anthranilic acid 2-tolu1dine-5-sulf0nic Chromium (twice) Rcddish-brown.

sulfonic acid. acid. -nitro-z-aminophenol do 4-nitro-2-aminopheno1- Chromium iron Derkbrown.

fi-sulionic acid. (twice). Picramic acid "do 2-aminophenol-4.6-d1- Iron (twice) Olive dark sulfonic acid. brown. Do do 4-nitro-2-aminopl1enol- Chrom1um(tw1ce) Dark red-brown.

fi-sulfonic acid.

I claim: wherein X stands for a member of the group 1. A20 dyestufis containing metal in a complex form of the general formula:

wherein X stands for a member of the group consisting of the hydroxy and the carboxylic acid group, Z stands for a member of the group consisting of the hydroxy, amino and a substituted amino group, R means a member of the group consisting of radicals of the benzene and naphthalene series, R1 and R2 stand for radicals of diazotization components suitable for producing azo dyestuffs, n stands for one of the numbers 1 and 0, R3 stands for a member of the group consisting of hydrogen, hydroxyl, alkyl, halogen, COOH and SO3H and Me means a metal of the atomic number 24-28 inclusive, being in form of their alkali metal salts generally dark, watersoluble powders dyeing leather generally even shades of excellent fastness to light.

2. A20 dyestufis containing metal in a complex form of the general formula:

leather generally even shades of excellent fastness to light.

The azo dyestufi corresponding in the form of its free acid to the following formula:

dyeing leather, especially glac leather deep blackish brown shades.

ERNST FELLMER. 

